krausen


krau·sen

K5113350 (kroi′zən, krou′-) or kräu·sen (kroi′zən)n. The yeasty foam that rises to the surface of fermenting wort; barm.tr.v. krau·sened, krau·sen·ing, krau·sens To add actively fermenting wort to a fermented wort, as before bottling.
[German Kräusen, from variant of Krausen, plural of Krause, frill, ruff, gather, crimp (in reference to the foam curling back from the edge of the container in which the beer ferments), from kraus, crinkled, frizzy, crumpled, from Middle High German krūs, curly, crimped; akin to Middle Dutch croes, curly, crimped, and English crouse.]